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Claude Sonnet 5 vs GPT-5.5
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Scores
Intelligence (ECI)—159
Coding9491
Math—97
Reasoning & Knowledge8892
Agentic & Tools—87
Specifications
DeveloperAnthropicOpenAI
FamilyClaudeGPT
ReleasedJun 30, 2026Apr 23, 2026
Parameters——
Availability—API access
Context window1M1.1M
Price — $/M input$2.00$5.00
Price — $/M output$10.00$30.00
Inputstext, image, filefile, image, text
Outputstexttext
Benchmarks
GPQA Diamond91%94%
Humanity's Last Exam40%44%
SciCode54%56%
AIME 2024/2025—100%
APEX—38%
ARC-AGI—95%
ARC-AGI-2—85%
FrontierMath—52%
FrontierMath Tier 4—35%
GSO (code optimization)—40%
SimpleBench—69%
SimpleQA Verified—63%
SWE-bench Verified—81%
Terminal-Bench—85%
WebDev Arena—1505
WeirdML—85%
τ²-bench—94%
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.